TreeNode.Depth 属性

  • 参考

定义

命名空间:
System.Web.UI.WebControls
程序集:
System.Web.dll

获取节点的深度。

public:
 property int Depth { int get(); };
[System.ComponentModel.Browsable(false)]
public int Depth { get; }
[<System.ComponentModel.Browsable(false)>]
member this.Depth : int
Public ReadOnly Property Depth As Integer

属性值

Int32

节点的深度。

属性
BrowsableAttribute

示例

下面的代码示例演示如何使用 Depth 属性来确定节点的深度。 它将深度为 1 的所有节点初始化为所选状态。 若要使此示例正常工作，必须将以下示例 XML 数据复制到名为 Newsgroup.xml 的文件。


<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  void Data_Bound(Object sender, TreeNodeEventArgs e)
  {

    // Check the depth of a node as it is being bound to data.
    // Initialize the Checked property to true if the depth is 1.
    if(e.Node.Depth == 1)
    {

      e.Node.Checked = true;

    }
    else
    {

      e.Node.Checked = false;

    }

  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>TreeNode Checked Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>TreeNode Checked Example</h3>
    
      <asp:TreeView id="NewsgroupTreeView" 
        DataSourceID="NewsgroupXmlDataSource"
        OnTreeNodeDataBound="Data_Bound"
        ShowCheckBoxes="All"
        ExpandDepth="2"  
        runat="server">
         
        <DataBindings>
          <asp:TreeNodeBinding DataMember="category" TextField="Name"/>
          <asp:TreeNodeBinding DataMember="group" TextField="Name"/>
        </DataBindings>
         
      </asp:TreeView>
      
      <asp:XmlDataSource id="NewsgroupXmlDataSource"  
        DataFile="Newsgroup.xml"
        runat="server">
      </asp:XmlDataSource>
    
    </form>
  </body>
</html>


<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  Sub Data_Bound(ByVal sender As Object, ByVal e As TreeNodeEventArgs)

    ' Check the depth of a node as it is being bound to data.
    ' Initialize the Checked property to true if the depth is 1.
    If e.Node.Depth = 1 Then

      e.Node.Checked = True

    Else

      e.Node.Checked = False

    End If

  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>TreeNode Checked Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>TreeNode Checked Example</h3>
    
      <asp:TreeView id="NewsgroupTreeView" 
        DataSourceID="NewsgroupXmlDataSource"
        OnTreeNodeDataBound="Data_Bound"
        ShowCheckBoxes="All"
        ExpandDepth="2"  
        runat="server">
         
        <DataBindings>
          <asp:TreeNodeBinding DataMember="category" TextField="Name"/>
          <asp:TreeNodeBinding DataMember="group" TextField="Name"/>
        </DataBindings>
         
      </asp:TreeView>
      
      <asp:XmlDataSource id="NewsgroupXmlDataSource"  
        DataFile="Newsgroup.xml"
        runat="server">
      </asp:XmlDataSource>
    
    </form>
  </body>
</html>

以下代码是上一个示例的示例 XML 数据。

<category name="news.microsoft.com">  
    <group name="microsoft.public.dotnet.framework.aspnet"/>  
    <group name="microsoft.public.dotnet.framework.aspnet.mobile"/>  
    <group name="microsoft.public.dotnet.framework.aspnet.webservices"/>  
</category>

注解

Depth使用 属性确定节点的深度。 深度表示节点和根节点之间的层次结构级别数。 例如，根节点的深度为零。 根节点的子节点的深度为 1，依类而行。

适用于

另请参阅